US12224440B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12224440-B2 |
| Application number | US-202218564734-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 14, 2022 |
| Priority date | Jun 28, 2021 |
| Publication date | Feb 11, 2025 |
| Grant date | Feb 11, 2025 |
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
What the patent document calls the invention.
A short plain-language summary of the technical disclosure.
Who owns or filed the patent and who is credited as inventor.
Filing, priority, publication, and grant dates set the timeline.
The legal scope of protection — read this for what is actually claimed.
Technology tags used to group this patent with similar filings.
Prior art links and similar publications in this corpus.
Official abstract text for this publication.
Disclosed herein is a process for making a coated cathode active material, where the process includes the following steps: (a) providing an electrode active material according to general formula Li 1+x TM 1−x O 2 , where TM is a combination of metals according to general formula (I), and x is in the range of from zero to 0.2, with a moisture content in the range of from 500 to 1,500 ppm, (b) reacting the electrode active material with a silicon alkoxide and an alkyl aluminum compound in one or more sub-steps, and (c) heat-treating the material so obtained in an oxygen-containing atmosphere at a temperature in the range of from 100 to 400° C. for 10 minutes to 4 hours.
Opening claim text (preview).
The invention claimed is: 1. A process for making a coated cathode active material, wherein said process comprises the following steps: (a) providing an electrode active material according to general formula Li 1+x TM 1−x O 2 , wherein TM is a combination of metals according to formula (I), and x is in a range of from zero to 0.2, with a moisture content in a range of from 500 to 1,500 ppm, with a being in a range of from 0.3 to 0.4, b being in a range of from zero to 0.1, c being in a range of from 0.6 to 0.7, and d being in a range of from zero to 0.1, M is Al or Ti or Zr or Mg, and a + b + c = 1 , (b) reacting said electrode active material with a silicon alkoxide and an alkyl aluminum compound in one or more sub-steps, and (c) heat-treating the material obtained in step (b) in an oxygen-containing atmosphere at a temperature in a range of from 100 to 400° C. for 10 minutes to 4 hours. 2. A process according to claim 1 , wherein the silicon alkoxide is selected from the group consisting of tetramethoxysilane and tetraethoxysilane. 3. A process according to claim 1 or 2 , wherein the alkyl aluminum compound in step (b) is selected from the group consisting of trimethylaluminum and triethylaluminum. 4. A process according to claim 1 , wherein a molar ratio of silicon to aluminum in step (b) is in a range of from 1:10 to 10:1. 5. A process according to claim 1 , wherein step (b) is performed in a presence of at least one organic solvent. 6. A process according to claim 1 , wherein in step (b) or in a sub-step before or after step (b) a carbonyl compound or an organometallic compound of cobalt is applied to the electrode active material provided in step (a) or resulting from step (b). 7. A particulate cathode active material comprising a core material according to general formula Li 1+x TM 1−x O 2 , wherein TM is a combination of metals according to formula (I), and x is in a range of from zero to 0.2, and wherein an outer surface of the core material is non-homogeneously coated with a mixed oxide of aluminum and silicon of uniform composition, with a being in a range of from 0.3 to 0.4, b being in a range of from zero to 0.1, c being in a range of from 0.6 to 0.7, and d being in a range of from zero to 0.1, M is Al or Ti or Zr or Mg, and a + b + c = 1 . 8. The particulate material according to claim 7 , wherein said coating comprises a compound selected from the group consisting of LiAlSiO 4 and LiAlSi 2 O 6 and a compound selected from the group consisting of Li 4 SiO 4 , Li 2 SiO 3 , and Li 2 Si 3 O 7 . 9. The particulate material according to claim 7 , wherein a molar ratio of silicon to aluminum is in a range of from 1:20 to 1:1. 10. A cathode comprising: (A) at least one particulate material according to claim 7 , (B) carbon in electrically conductive form, and (C) a binder polymer.
Positive electrodes · CPC title
of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title
as layered products · CPC title
Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title
Electric properties · CPC title
Related publications grouped by family.
Answers are generated from the same data shown on this page.